Drier.



it was im ossible to conduct the hot rnace directly through the ody ARNOLD r. smcnam, or NEW YORK, n. Y.

DRIER.

Specification of Letters Patent.

Patented Feb. re, rare.

Application filed September 16, 1916. Serial No. 1203.33.

To all whom it may concern:

Be it known that I, ARNOLD F. SINCLAIR, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in lDriers, of whichthe following is a specification.

My invention relates to machines for drying pulverized substances, and particularly those substances which will be destroyed or injured if brought in contact with a flame. The machine which I have invented-is of a special value in drying pulverized coal to be used as fuel in cement kilns, but is applicable also to the drying of many other substances.

In machines heretofore used for the drying of pulverized coal, it has been customary to leave a space or opening between the furnace and the body of the drier in which the pulverized coal is contained. This space was necessary in former machines to prevent the'flame from the furnace entering the drier and igniting and destroylng the pulverized coal. In these machines, therefore, ases from the of the drier containing the pulverized coal. In consequence, much of the heatlin these gases was wasted.

I have invented a drier in which the hot gases from the furnace are passed directly;

through the cylinder containing the material to be dried. The body of my drier is connected directly to the furnace, but a screen or series of screens is interposed at the outer end adjacent to the furnace, whereby the flames in the furnace are prevented fromentering the body of the drier. By this means I obtain efficient heating of the drier without danger of igniting the pulverized material. 1

One embodiment of my invention is illus trated in the accompanying drawings, in which- Figure 1 is a side elevation of my drier partly in section;

Fig. 2 is a transverse section taken on the line Qr--2 of Fig. 1;

Fig. 3 is a similar section taken on the line 33 of Fig. 1;

Fig. 4is a similar. section taken on the line 44 of Fig. 1; and t Fig. 5 is an enlarged sectional elevation of the end of my drier adjacent to the furnace.

into the outer air.

Fig. 6 is a diagrammatic illustration of a portion, of the flame arresting screen, indicating different degrees of mesh.-

In the drawings, 1 represents the furnace and 2 the chimney through which the prodnets of combustion from the furnace escape Between the furnace and the chimney is a rotary cylinder 3. This cylinder is supported on the roller bearings 4:, 4, and rotated by power applied to the gear '5. The left-hand end of the cylinder 3 has a close running fit with the wall of the furnace, while the right-hand end has a similar fit with the lower portion of the chimney. Within the cylinder are the shelves or Z-bars 6, which gather up and scatter the pulverized material when the cylinder is rotated, the rotation being in a clockwise direction (Fig. 4.).

A chute 7 is placed in the lower portion of the chimney 2 for feeding the pulverized material into the right-hand end of the cylinder.

Near the left-hand end of the cylinder are a series of screens 8. The object of these screens is to prevent the flame from entering the cylinder, while at the same time permitting the hot products of combustion to pass through it.

Asingle screen may be used for this purpose, but I have found that if only one screen is used, it is necessary to make the mesh of the screen very fine, in order to prevent the admission of the flame. A single fine screen, while operating satisfactorily at first, will not long endure the heat which is brought in contact with it. In order to provide means for excluding the flame which will successfully endure the great heat at the furnace end of the drier, I find it preferable to provide a series of six' screens spaced about two inches apart. The screens are of different mesh, the outer screen, that is the screen nearest the furnace, being the coarsest and that farthest from the furnace being the finest. I have found it satisfactory to make the first screen eight mesh, the second ten mesh, the thlrd twelve mesh, the fourth fourteen mesh, the fifth eighteen mesh, and the last twenty mesh.

I preferably use a flange 9 at the lefthand end of the cylinder 3 to direct the hot gases toward the central part of the cylinder.

The presence of the screen at the lefthand end of the cylinder in my drier prevents the removal of the pulverized material from the end of the cylinder, as has been customary in previous driers. I have, there* 6. A drier comprising a furnace,a drying fore, provided means for removing mate,- rial through the wall of the cylinder. These means consist of a series of openings 10, just to the right of the screenS. The

portion of the cylinder containing these openings is surrounded by an annular casing 11. This casing has a running fit with the cylinder, but does not, rotate with it. It is held against rotation by a bracket or brace .arm 13 anchoredin the. wall-0f the furnace and attached by a bolt or otherwise to the casing, or by any other suitable means within the skill of the mechanic. At the bottom of the casing 11 is a discharge chute 12. The cylinder 3 is slightly inclined from right to left, so that the mate rial introduced at its right-hand end will work toward the left-hand end and be discharged through the apertures 10',and the chute 12. j

I wish it clearly-understood that my inve'ntion is not limited to'the precise apparatus described.

What I claim is 1. A drier comprising'a furnace, a drying chamber connected to said furnace and from which ignition flame. is excluded, and a' flame arresting screen between said furnace and said drying chambers 2. A drier comprising a furnace, a drying chamber connected to said furnace so that the products of combustion fromsa-id furnace pass through it and from which ignition flame is excluded, and afl'ame'arresting screen between said furnace and said drying chamber. a

-3. AAdrier comprisin a-furnace, a'chimmy, a drying chamber' etween said'furnace and said chimney through which the prod-' nets of combustion from said furnace pass and from which ignition flame is excluded,

and a flame arresting screen between said furnace and said drying chamber.

4:. 'A drier comprlsinig a furnace, a rotary drying chamber, connected to said furnace and from which ignition flame is excluded, and a flame arresting screen'at the end of said drying chamber adjacent to said furnace. i

5.. A drier comprising a furnace having a wall containing a circular aperture, a cylindrical drying chamber having a running fit with said aperture in the wall of said furnace and from which ignition flame is excluded,a flame arresting screen at the end of said drier adjacent to said furnace, and means for rotating said drying chamber.

chamber connected to said furnace and from which ignitionflame is excluded, and a series of flame arresting screens between said furnace and said dryin chamber. v

7. A drier comprising a furnace having a wall containing a circular aperture, a chim-v ney spaced apart from said furnace having a wall containing a circular aperture, a rotary drying cylinder having a runnin' contact with the circular aperture in 'sai furnace wall at one of its ends and a running contact with the circular aperture in said chimney with the other of its ends and from which chamber ignition flame is excluded,

and a flame arrestlng screen in said cylinder eluded, a1 flame arrestin screen in said cy1- in'd'er near the end a acent to said fur; nace, means for introducing pulverized material at one end of said cylinder, means for discharging pulverized material near the other end of said cylinderand comprising an aperture in the wall of said cylinder, a

fixed annular casing surrounding said cylinder and inclosing said aperture, and a discharge'opening insaid annular casing.

9. A drier comprising a furnace, a drying chamber connected to said furnace, and

from which ignition flame is excluded, and

' a series of spaced flame arresting screens begween said furnace and saiddrying cham- 10.-'A drier comprising a furnace, a drying chamber connected to said furnace, a series of screens of difi'erent mesh between said. furnace and said drying chamber, the screen nearest the furnace being of the coarsest mesh, and that farthest. from the furnacebeing of the finest mesh.

11. A drier comprising a furnace, a drying chamber connected to said furnace, and a series of spaced screens of graded mesh between said furnace and said drying chamher, the screen nearest the furnace being the coarsest and that farthest from the'fur- 

